The present wheel chair, especially for invalids, is foldable in a verticalirection rather than horizontally to transform the chair into a very compact package. For this purpose all foldable components of the chair are equipped with journals having journal axes extending perpendicularly to a vertical...http://www.google.sh/patents/US4527829?utm_source=gb-gplus-sharePatent US4527829 - Foldable wheel chair, especially for invalids
